1,720,965 research outputs found
Cervical vertebral maturation: Are postpubertal stages attained in all subjects?
No full textIntroduction: The cervical vertebral maturation (CVM) method comprises 6 stages reported to be prepubertal (1 and 2), pubertal (3 and 4) and postpubertal (5 and 6), and its use has been recommended for planning treatment timing in orthodontics. Reliable use of the method implies that pubertal stages have to mature into postpubertal as soon as the growth peak is terminated. The present study was aimed at determining whether postpubertal CVM stages 5 or 6 are attained in all subjects. Methods: A total of 450 adult subjects (270 females and 180 males; mean age, 30.4 ± 27.3 years; range, 20-45 years) seeking orthodontic treatment and having a lateral head film were included in the study. Customized cephalometric analysis was used, and each recording was converted into an individual CVM code according to the concavities of the C2 to C4 and shapes of C3 and C4. The retrieved CVM codes, either falling within the reported norms (regular cases) or not (exception cases), were also converted into the CVM stages and a newly introduced CVM score (0-9) capable of defining intermediate stage. Results: The most frequent CVM stage was 5, while the CVM stage 6 was attained in only one third of the sample. Up to about 11% of adult subjects showed the pubertal CVM stage 4. Irrespective of the CVM stage or CVM score, no significant differences were seen between the sexes or across ages. The C4 showed a rectangular vertical shape in only 16.4% of the cases. Conclusions: The percentage of adult population maintaining a pubertal CVM stage 4 is not high, but still relevant from a clinical standpoint. In light of this finding, planning treatment timing-based only on CVM appears not fully reliable
Diagnostic performance of 3-dimensional evaluation of palatal vault changes in assessing successful treatment of constricted maxilla in growing subjects.
No full textAssessment of facial asymmetry in growing subjects with a three-dimensional laser scanning system
No full textAuthors – Primozic J, Perinetti G, Zhurov A, Richmond S, Ovsenik M
Objectives – To evaluate facial asymmetry in growing subjects with no malocclusion on three-dimensional laser facial scans.
Setting and Sample Population – Twenty-seven healthy Caucasian children (15 boys and 12 girls, aged 5.4 ± 0.3 years) in the primary dentition without malocclusion were randomly selected from a local kindergarten in Slovenia.
Material and Methods – Surface facial images were obtained using a three-dimensional laser scanning system at baseline and at 18, 30, 42 and 54 months of follow-up. Facial asymmetry was assessed quantitatively by measuring the average distance between facial image and mirrored image. Further, the percentage of asymmetry was calculated as the percentage of image to mirrored image not coinciding within 0.5 mm. Qualitative assessment was performed on colour deviation maps by recording the predominant side of the face for the upper, middle and lower parts of the face separately. Nonparametric tests were used for data analysis.
Results – No face was perfectly symmetric. The average distance between the mirrored images for the whole face ranged 0.22–0.85 mm and the percentage of asymmetry 7.8–66.9. There were no significant gender differences (p > 0.05), and no significant change was found over the observed period. The upper part of the face was the least asymmetric, while the lower and middle parts showed similar degrees of asymmetry.
Conclusion – Facial asymmetry is already present at an early developmental stage and does not show any tendency to increase or decrease with growth in the pre-pubertal period
The diagnostic potential of static body-sway recording in orthodontics: a systematic review.
No full textIs gingival crevicular fluid volume sensitive to orthodontic tooth movement? A systematic review of split-mouth longitudinal studies.
No full textTo assess the scientific evidence for detectable volume changes of gingival crevicular fluid (GCF) incident to orthodontic tooth movement (OTM). A literature survey of longitudinal split-mouth studies was performed searching PubMed, SCOPUS and the Cochrane Library, with the last access in 15 April 2012. After selection, 13 articles qualified for the final analysis. One study was judged to be of medium/high quality, six were of medium quality and the rest of low quality. Across all studies, there was very little or no statistically significant change in GCF volume incident to OTM. The changes seen were generally ascribed to the clinical or subclinical inflammation consequent to placement of the fixed orthodontic appliance. A reappraisal of the data provided in these studies was performed by comparing the GCF volume from the test (moved) and control (non-moved) teeth, in terms of effects-size (ES) coefficients and variations, as percentages. Generally, the ES coefficients and the variations were below 1.0 and 20%, respectively. Therefore, when using current methods to collect and measure GCF volume, there was no meaningful diagnostic potential for the GCF volume as an index of tissue remodelling incident to OTM. The GCF volume is not a reliable index for tissue remodelling incident to OTM
Customized HIRME vs Haas expander: A 3-dimensional volumetric and surface evaluation
Full text linkRapid Maxillary Expansion (RME) is a commonly used intervention to address posterior crossbite and alleviate functional issues associated with anterior crowding. The purpose of the study is to compare the quality and quantity of expansion of two different Haas devices with anchorage on deciduous elements, one custom-made (HIRME), through a three-dimensional analysis of the changes in the palatine vault after expansion. The study retrospectively examined a total of 30 patients, equally divided into two groups, and showed an average increase in palatal surface area of 28.81 % for the traditional Haas expander and 24.38 % for the HIRME device. The increase in surface and volume was significant for both devices (p < 0.001), while no significant differences in surface or volume increase were found between the two devices (Haas: p = 0.365; Hirme: 0.354). This study underlined the efficacy of the custom HIRME device in increasing palatal surface and volume in patients with transverse discrepancy
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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